1 /* smp.c: Sparc SMP support.
3 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
4 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
12 #include <linux/threads.h>
13 #include <linux/smp.h>
14 #include <linux/smp_lock.h>
15 #include <linux/interrupt.h>
16 #include <linux/kernel_stat.h>
17 #include <linux/init.h>
18 #include <linux/spinlock.h>
21 #include <linux/seq_file.h>
22 #include <linux/cache.h>
23 #include <linux/delay.h>
25 #include <asm/ptrace.h>
26 #include <asm/atomic.h>
30 #include <asm/pgalloc.h>
31 #include <asm/pgtable.h>
32 #include <asm/oplib.h>
33 #include <asm/hardirq.h>
34 #include <asm/cacheflush.h>
35 #include <asm/tlbflush.h>
36 #include <asm/cpudata.h>
38 volatile int smp_processors_ready = 0;
40 int smp_threads_ready=0;
41 volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,};
42 unsigned char boot_cpu_id = 0;
43 unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */
44 int smp_activated = 0;
45 volatile int __cpu_number_map[NR_CPUS];
46 volatile int __cpu_logical_map[NR_CPUS];
47 cycles_t cacheflush_time = 0; /* XXX */
48 unsigned long cache_decay_ticks = 100;
50 cpumask_t cpu_online_map = CPU_MASK_NONE;
51 cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
53 /* The only guaranteed locking primitive available on all Sparc
54 * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
55 * places the current byte at the effective address into dest_reg and
56 * places 0xff there afterwards. Pretty lame locking primitive
57 * compared to the Alpha and the Intel no? Most Sparcs have 'swap'
58 * instruction which is much better...
61 /* Used to make bitops atomic */
62 unsigned char bitops_spinlock = 0;
64 volatile unsigned long ipi_count;
66 volatile int smp_process_available=0;
67 volatile int smp_commenced = 0;
69 void __init smp_store_cpu_info(int id)
73 cpu_data(id).udelay_val = loops_per_jiffy;
75 cpu_find_by_mid(id, &cpu_node);
76 cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
77 "clock-frequency", 0);
78 cpu_data(id).prom_node = cpu_node;
79 cpu_data(id).mid = cpu_get_hwmid(cpu_node);
80 if (cpu_data(id).mid < 0)
81 panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
84 void __init smp_cpus_done(unsigned int max_cpus)
90 printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
91 panic("SMP bolixed\n");
94 struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };
96 void __init smp_boot_cpus(void)
98 extern void smp4m_boot_cpus(void);
99 extern void smp4d_boot_cpus(void);
101 if (sparc_cpu_model == sun4m)
107 void smp_send_reschedule(int cpu)
112 void smp_send_stop(void)
116 void smp_flush_cache_all(void)
118 xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all));
119 local_flush_cache_all();
122 void smp_flush_tlb_all(void)
124 xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all));
125 local_flush_tlb_all();
128 void smp_flush_cache_mm(struct mm_struct *mm)
130 if(mm->context != NO_CONTEXT) {
131 cpumask_t cpu_mask = mm->cpu_vm_mask;
132 cpu_clear(smp_processor_id(), cpu_mask);
133 if (!cpus_empty(cpu_mask))
134 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm);
135 local_flush_cache_mm(mm);
139 void smp_flush_tlb_mm(struct mm_struct *mm)
141 if(mm->context != NO_CONTEXT) {
142 cpumask_t cpu_mask = mm->cpu_vm_mask;
143 cpu_clear(smp_processor_id(), cpu_mask);
144 if (!cpus_empty(cpu_mask)) {
145 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm);
146 if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm)
147 mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id());
149 local_flush_tlb_mm(mm);
153 void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start,
156 struct mm_struct *mm = vma->vm_mm;
158 if (mm->context != NO_CONTEXT) {
159 cpumask_t cpu_mask = mm->cpu_vm_mask;
160 cpu_clear(smp_processor_id(), cpu_mask);
161 if (!cpus_empty(cpu_mask))
162 xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end);
163 local_flush_cache_range(vma, start, end);
167 void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
170 struct mm_struct *mm = vma->vm_mm;
172 if (mm->context != NO_CONTEXT) {
173 cpumask_t cpu_mask = mm->cpu_vm_mask;
174 cpu_clear(smp_processor_id(), cpu_mask);
175 if (!cpus_empty(cpu_mask))
176 xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end);
177 local_flush_tlb_range(vma, start, end);
181 void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
183 struct mm_struct *mm = vma->vm_mm;
185 if(mm->context != NO_CONTEXT) {
186 cpumask_t cpu_mask = mm->cpu_vm_mask;
187 cpu_clear(smp_processor_id(), cpu_mask);
188 if (!cpus_empty(cpu_mask))
189 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page);
190 local_flush_cache_page(vma, page);
194 void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
196 struct mm_struct *mm = vma->vm_mm;
198 if(mm->context != NO_CONTEXT) {
199 cpumask_t cpu_mask = mm->cpu_vm_mask;
200 cpu_clear(smp_processor_id(), cpu_mask);
201 if (!cpus_empty(cpu_mask))
202 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page);
203 local_flush_tlb_page(vma, page);
207 void smp_reschedule_irq(void)
212 void smp_flush_page_to_ram(unsigned long page)
214 /* Current theory is that those who call this are the one's
215 * who have just dirtied their cache with the pages contents
216 * in kernel space, therefore we only run this on local cpu.
218 * XXX This experiment failed, research further... -DaveM
221 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page);
223 local_flush_page_to_ram(page);
226 void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
228 cpumask_t cpu_mask = mm->cpu_vm_mask;
229 cpu_clear(smp_processor_id(), cpu_mask);
230 if (!cpus_empty(cpu_mask))
231 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr);
232 local_flush_sig_insns(mm, insn_addr);
235 extern unsigned int lvl14_resolution;
237 /* /proc/profile writes can call this, don't __init it please. */
238 static spinlock_t prof_setup_lock = SPIN_LOCK_UNLOCKED;
240 int setup_profiling_timer(unsigned int multiplier)
245 /* Prevent level14 ticker IRQ flooding. */
246 if((!multiplier) || (lvl14_resolution / multiplier) < 500)
249 spin_lock_irqsave(&prof_setup_lock, flags);
250 for(i = 0; i < NR_CPUS; i++) {
252 load_profile_irq(i, lvl14_resolution / multiplier);
253 prof_multiplier(i) = multiplier;
255 spin_unlock_irqrestore(&prof_setup_lock, flags);
260 void __init smp_prepare_cpus(unsigned int maxcpus)
264 void __devinit smp_prepare_boot_cpu(void)
266 current_thread_info()->cpu = hard_smp_processor_id();
267 cpu_set(smp_processor_id(), cpu_online_map);
268 cpu_set(smp_processor_id(), phys_cpu_present_map);
271 int __devinit __cpu_up(unsigned int cpu)
273 panic("smp doesn't work\n");
276 void smp_bogo(struct seq_file *m)
280 for (i = 0; i < NR_CPUS; i++) {
283 "Cpu%dBogo\t: %lu.%02lu\n",
285 cpu_data(i).udelay_val/(500000/HZ),
286 (cpu_data(i).udelay_val/(5000/HZ))%100);
290 void smp_info(struct seq_file *m)
294 seq_printf(m, "State:\n");
295 for (i = 0; i < NR_CPUS; i++) {
297 seq_printf(m, "CPU%d\t\t: online\n", i);